[FieldTrip] Cluster-based permutation tests on event related potentials

Stephen Politzer-Ahles politzerahless at gmail.com
Wed Feb 15 01:43:54 CET 2017

Hi Antonio,

It is possible to run cluster tests on the data you have already
pre-processed, you just need to get the data into a fieldtrip structure. I
usually find the easiest way to do this is to process two original files by
hand in fieldtrip up to the point of creating a grand average structure
using ft_timelockgrandaverage, to see what the appropriate structure looks
like, and then sticking the actual data into that structure (in the
.individual or .avg field) and updating the appropriate fields.

As Zdenko mentioned, there are also other tools available that can do this,
including EEGLAB itself and the mass univariate toolbox.


Stephen Politzer-Ahles
The Hong Kong Polytechnic University
Department of Chinese and Bilingual Studies

On Wed, Feb 15, 2017 at 8:34 AM, <fieldtrip-request at science.ru.nl> wrote:

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> ----------------------------------------------------------------------
> Message: 1
> Date: Tue, 14 Feb 2017 12:37:27 +0100
> From: Antonio Arjona Valladares <aarjona at us.es>
> To: fieldtrip at science.ru.nl
> Subject: [FieldTrip] Cluster-based permutation tests on event related
>         potentials
> Message-ID: <47672490e00babb1106026384bbbe1a9 at us.es>
> Content-Type: text/plain; charset="utf-8"
> Hello everyone!
> This is my query:
> > We have two groups of EEG data (recorded in a 'Delayed Match to Sample
> task') pre-processed with Matlab and EEGlab. Each group is a matrix (.mat)
> which has 3 dimensions (channels x time x subjects). At this point, we are
> interested in apply the Cluster-based permutation test for nonparametric
> tests (Maris and Oostenveld, 2007) in order to find out the possible
> significant differences between these two groups on the different event
> related potentials.
> >
> > The question is wether we have the possibility to apply this non
> parametric test, using field trip, EEGLAB or any other software, on this
> EEGLAB pre-processed matrix data (.mat); or, on the other hand, we have to
> start from the raw data (recorded with ASA (.cnt)) and go through all the
> necessary steps indicated on the methodology of the Cluster-based
> permutation test.
> >
> > Thank you very much.
> >
> > Best,
> --
> Antonio Arjona Valladares
> Research Technician (BS)
> Human Psychobiology Lab,
> Experimental Psychology Department, University of Seville,
> C/Camilo Jos? Cela s/n, 41018-Sevilla,
> Spain
> Tel: +34 954 55 78 00 - 954 55 69 41
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